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6ce2e188 GG |
1 | |
2 | /* | |
3 | * ACPI support for platform bus type. | |
4 | * | |
5 | * Copyright (C) 2015, Linaro Ltd | |
6 | * Author: Graeme Gregory <graeme.gregory@linaro.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/acpi.h> | |
14 | #include <linux/amba/bus.h> | |
15 | #include <linux/clkdev.h> | |
16 | #include <linux/clk-provider.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/ioport.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | ||
23 | #include "internal.h" | |
24 | ||
25 | static const struct acpi_device_id amba_id_list[] = { | |
26 | {"ARMH0061", 0}, /* PL061 GPIO Device */ | |
27 | {"", 0}, | |
28 | }; | |
29 | ||
30 | static void amba_register_dummy_clk(void) | |
31 | { | |
32 | static struct clk *amba_dummy_clk; | |
33 | ||
34 | /* If clock already registered */ | |
35 | if (amba_dummy_clk) | |
36 | return; | |
37 | ||
628e35ba | 38 | amba_dummy_clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 0); |
6ce2e188 GG |
39 | clk_register_clkdev(amba_dummy_clk, "apb_pclk", NULL); |
40 | } | |
41 | ||
42 | static int amba_handler_attach(struct acpi_device *adev, | |
43 | const struct acpi_device_id *id) | |
44 | { | |
45 | struct amba_device *dev; | |
46 | struct resource_entry *rentry; | |
47 | struct list_head resource_list; | |
48 | bool address_found = false; | |
49 | int irq_no = 0; | |
50 | int ret; | |
51 | ||
52 | /* If the ACPI node already has a physical device attached, skip it. */ | |
53 | if (adev->physical_node_count) | |
54 | return 0; | |
55 | ||
56 | dev = amba_device_alloc(dev_name(&adev->dev), 0, 0); | |
57 | if (!dev) { | |
58 | dev_err(&adev->dev, "%s(): amba_device_alloc() failed\n", | |
59 | __func__); | |
60 | return -ENOMEM; | |
61 | } | |
62 | ||
63 | INIT_LIST_HEAD(&resource_list); | |
64 | ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); | |
65 | if (ret < 0) | |
66 | goto err_free; | |
67 | ||
68 | list_for_each_entry(rentry, &resource_list, node) { | |
69 | switch (resource_type(rentry->res)) { | |
70 | case IORESOURCE_MEM: | |
71 | if (!address_found) { | |
72 | dev->res = *rentry->res; | |
73 | address_found = true; | |
74 | } | |
75 | break; | |
76 | case IORESOURCE_IRQ: | |
77 | if (irq_no < AMBA_NR_IRQS) | |
78 | dev->irq[irq_no++] = rentry->res->start; | |
79 | break; | |
80 | default: | |
81 | dev_warn(&adev->dev, "Invalid resource\n"); | |
82 | break; | |
83 | } | |
84 | } | |
85 | ||
86 | acpi_dev_free_resource_list(&resource_list); | |
87 | ||
88 | /* | |
89 | * If the ACPI node has a parent and that parent has a physical device | |
90 | * attached to it, that physical device should be the parent of | |
91 | * the amba device we are about to create. | |
92 | */ | |
93 | if (adev->parent) | |
94 | dev->dev.parent = acpi_get_first_physical_node(adev->parent); | |
95 | ||
96 | ACPI_COMPANION_SET(&dev->dev, adev); | |
97 | ||
98 | ret = amba_device_add(dev, &iomem_resource); | |
99 | if (ret) { | |
100 | dev_err(&adev->dev, "%s(): amba_device_add() failed (%d)\n", | |
101 | __func__, ret); | |
102 | goto err_free; | |
103 | } | |
104 | ||
105 | return 1; | |
106 | ||
107 | err_free: | |
108 | amba_device_put(dev); | |
109 | return ret; | |
110 | } | |
111 | ||
112 | static struct acpi_scan_handler amba_handler = { | |
113 | .ids = amba_id_list, | |
114 | .attach = amba_handler_attach, | |
115 | }; | |
116 | ||
117 | void __init acpi_amba_init(void) | |
118 | { | |
119 | amba_register_dummy_clk(); | |
120 | acpi_scan_add_handler(&amba_handler); | |
121 | } |